/Engine/Plugins/Importers/USDImporter/Source/USDUtilities/Public/USDGeomMeshConversion.h
Description of a material slot we need to add to aUStaticMeshorUSkeletalMeshto have it represent a material binding in a prim. It may or may not contain an actual material assignment.
struct FUsdPrimMaterialSlot
EPrimAssignment...
AssignmentType
bool
bMeshIsDoubleSided
FString
MaterialSource
What this represents depends on AssignedMaterialType
TSet<FString>
PrimPaths
Path to the prims that contain this material assignment (e.g. '/Root/my_cube' or '/Root/my_cube/geomsubset_0'. This is a set because this single material slot in UE may be merged from N identical prims.